Improvement in elbows for hot-air pipes



JOHvKNM. T'HATCHER.

Irmarovement-in Elbows` for Hot-Air'Pipes.

Patented June 6,1871.

Wilzeses l x a i l i JOHN M. THATGHER, 0E JEnsEY orrY, nEvv JERSEY.

IMPROVEMENT IN EI ..BOWS- FOR HOT-AIR PIPES.

Specification forming part of Letters Patent N o. 115,785, dated June 6, 1871.

I, JOHN M. THATGHER, of Jersey City, county of Hudson, State of New Jersey, have invented an .Improved Elbow for Hot-Air Pipes, of which the following is a specification:

VNat-Wc and Object of the Intention.

Description of the Accompanying Drawing.

Figure l is a perspective view representing the ordinary method of joining the main pipe to the flattened distributing-pipe of a heatingfurnace 5 Fig. 2, a side view of one of the sections of my improved elbow; Fig. 3, an end view of the elbow; and Fig. 4 1, a plan view of the same.

General Description. In heating buildings with hot air it is usual to make the main pipes, which are situated in the cellars, cylindrical, while the distributing-pipes are attened so as to pass upward through the necessarily contracted lues in the wall. lIhe junction of the cylindrical with the iiattened pipes has heretofore been accomplished in the manner illustrated in Fig. l, A representing the cylindrical and B the distributing pipe. vThis plan of joining the pipes not only involves much tedious manipulation, but

:the junction is so abrupt as to interfere to a considerable extent with the free passage of heated air from the main to the distributing pipe. My improved elbow has been designed with a view of remedying these evils. In' the present instance the elbow is made of light cast-iron, and in two sections riveted together at w a: w, as shown in the drawing, the elbow having a circular branch, a, for receiving the end ofthe main cylindrical pipe, while the other branch Z1 is made oval, or of any other figure adapted to the attened distributingpipe, the back y of the elbow being rounded, as shown, so as to direct the hot air toward and through the branch b, thereby avoiding the ordinary abrupt junction, which, as before remarked, interferes with the free passage oi' the air from the main to the distributing-pipe. In the present instance the branch b is of an oval form, and this shape gradually disappears into the circular shape of the branch a.; but the branch b may be, at its orifice, of the oblong shape shown by dotted lines in Fig. 3,

one form to one of a different sectional shape.

It will also be seen that the elbow may be cast in one piece, or made of sections of sheet metal struck up to the desired shape.

Claim.

An elbow, the branches oi' which are arranged at right angles, or nearly so, to each other, and are of different forms, one being adapted to a flattened pipe, and another to a Acylindrical pipe, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

J OHN M. THATGHER.

Witnesses:

WM. A. STEEL, LOUIS BOSWELL. 

